STMicroelectronics 32L4R9IDISCOVERY - EXT_I2 C Connector CN7; Table 24. SWD Header CN5; Table 25. EXT_I2 C Connector CN7; Table 26. I2 C1 Addresses (on Board)

Connectors UM2271
40/78 DocID030906 Rev 2
11.11 EXT_I2C connector CN7
The EXT_I2C connector socket is used to connect external modules to I2C1 interface or to
monitor the I2C1 interface.
Figure 18. EXT_I2C connector CN7
As I2C1 is available for external use, it is important to note that those following I2C1
applications and addresses are already used on board:
Depending on the I2C module plugged into CN7, I2C1 could even be used up to
Fast mode + (1 MHz).
Table 24. SWD header CN5
Pin number Description Pin number Description
1 VDD 4 SWDIO (PA13)
2 SWCLK (PA14) 5 NRST
3GND 6SWO (PB3)
Table 25. EXT_I2C connector CN7
Pin number Description Pin number Description
1 I2C1_SDA (PG13) 5 +3V3
2NC 6NC
3 I2C1_SCL (PB6) 7 GND
4 EXT_RESET (MFX_GPIO11) 8 NC
Table 26. I2C1 addresses (on board)
Application
W/R I2C
address
I2C max. speed Comment
DSI display Touch Panel 0x71/0x70 400 kHz Default I2C address
Audio Codec 0x95/0x94 100 kHz Default I2C address
CAMERA 0x61/0x60 400 kHz For STM32F4DIS-CAM Module
MFX_V3 0x85/0x84 400 kHz Default I2C address
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